| 摘要 |
A cam assembly includes a generally cylindrical central body formed with an external ring of teeth and encircled by two identical annular members each having two inwardly directed pawls resiliently engaging the teeth at circumferentially spaced locations. The annular members have profiled outer peripheral control surfaces for co-operating with a cam follower extending across both surfaces. To adjust the overall control surface, the annular members are manually turned about the body axis, the pawls riding over the teeth, and then the annular members are clamped to the body, while the pawls hold the annular members in position.
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